Anode carbon block provided with conductive connection concave groove

Abstract

The invention relates to an anode carbon block provided with a conductive connection concave groove, which is mainly applied to the assembly configuration of an anode conductive device of an aluminum electrolysis cell and the production of electrolytic aluminum. In order to overcome the technical defects of high voltage drop, high assembly energy consumption, complex process and high construction cost of an anode conductive device formed by assembling an anode carbon block and an anode steel claw together by casting a ferrophosphorus ring in the prior art, the invention discloses a technical scheme of a novel construction connection mode of an anode carbon block and an anode conductive metal structure. The innovative technical scheme is characterized in that the upper part of the anode carbon block is changed into a flat-top design, and an anode conductive connection concave groove which is used for constructing and installing an anode conductive cross beam and has the section width larger than the section height is formed in the upper top part of the flat-top anode carbon block. And the anode conductive concave groove is connected with an anode conductive metal device of the aluminum electrolysis cell.

Description

[0001] Technical field: An anode carbon block provided with a conductive connection concave groove is mainly used for the assembly configuration of the anode conductive device of an aluminum electrolytic cell and the electrolytic aluminum production.

[0002] Technical background: The anode carbon block in the electrolytic aluminum production process is not only a raw material component participating in the thermoelectrochemical replacement reaction of aluminum electrolysis, but also an anode conductive component that conducts the anode current to the electrolyte. In order to realize its function of conducting the anode current of the anode busbar of the aluminum electrolytic cell to the anode carbon block, the existing technology is to prefabricate a number of concave circular carbon bowls on the upper part of the anode carbon block, and then adopt the method of casting phosphorus pig iron to connect the anode steel claw head of the anode metal conductive device with the anode carbon block through conductive structure with a cast phosphorus iron ring, so as to form an integral anode conductive device composed of an aluminum guide rod and an explosion welding piece on the upper part and an anode steel claw and anode carbon on the lower part.

[0003] The existing aluminum electrolytic cell uses anode steel claws and anode carbon to construct an anode conductive device by casting phosphorus pig iron. The anode conductive device has the following technical defects: first, a large amount of electric energy is consumed to melt phosphorus pig iron during anode assembly; second, a large amount of manpower, material resources and mechanical equipment are required for assembly; third, the connection resistance value between the anode carbon block and the anode steel claw head and the voltage drop of the iron-carbon structure are high, and a large amount of electrolytic DC power consumption will be lost during the electrolysis process, resulting in a decrease in the current efficiency of the aluminum electrolytic cell.

[0004] In view of this, domestic and foreign engineers and technicians in the electrolytic aluminum industry are trying to reduce the voltage drop between the anode steel claw and the barrier carbon block as one of the key research topics to reduce the energy consumption of electrolysis in order to achieve energy saving, emission reduction and low carbon production of electrolytic aluminum. However, due to the structural limitations of the anode conductive device in the existing technology, it is difficult to achieve the ideal energy saving effect, and the energy saving effect is very small. So far, the electrolytic aluminum industry has been using the phosphorus iron ring casting technology.

[0005] Content of the invention: In order to overcome the above technical defects of the prior art of constructing a circular anode carbon bowl on the anode carbon block, and then inserting the anode steel claw head into the anode carbon bowl, and assembling the anode carbon block and the anode steel claw together using a cast ferrophosphorus ring to form an anode conductive device with high connection voltage drop, high assembly energy consumption, complex procedures and high construction costs, the technical solution of the present invention discloses a new technical solution for the construction and connection method of the anode carbon block and the anode conductive metal structure.

[0006] The characteristic of this innovative technical solution is that, at the upper part of the anode carbon block, the structural design of the anode boss of the prior art and the structural design and construction configuration of the anode carbon bowl within the anode boss are cancelled, that is, the upper part of the anode carbon block is changed to a flat top design, and an anode conductive connection concave groove with a cross-sectional width greater than its cross-sectional height is constructed on the upper top part of the flat top anode carbon block for constructing and installing the anode conductive cross beam.

[0007] The technical solution of the present invention is to integrate the mechanical structure of the anode carbon block and the anode conductive crossbeam of the anode conductive metal structure, and the electrical structure design principle of the two for conductive connection is: the thermal expansion coefficient of the anode conductive crossbeam is greater than the characteristic of the carbon material of the anode carbon block, so that the anode conductive crossbeam can produce a firm structural connection and a tight iron-carbon interface conductive connection after being assembled into the anode conductive connection concave groove. That is, after the anode conductive crossbeam is assembled and inserted into the anode conductive concave groove, a firm structural connection and a tight iron-carbon combined conductive interface connection can be formed between the anode carbon block and the anode conductive crossbeam.

[0008] According to the above technical scheme, in order to ensure and improve the connection strength between the anode conductive beam and the anode carbon block, the anode carbon block is developed to produce up and down displacement and fall off from the anode conductive beam of the anode metal conductive device, and the cross-section of the anode conductive connection concave groove can be set to a concave groove type with a cross-section width greater than the height, or set to a trapezoidal groove type, or a mortise and tenon concave groove structure with a bite groove on the side wall.

[0009] According to the above technical solution, the dimensional deviation between the cross-sectional width of the concave groove of the anode conductive connection and the assembly width between the cross-sectional width of the anode conductive beam should be smaller than the variable value of the linear width of the thermal expansion of the anode conductive beam in the width direction under the technical conditions of electrolytic heat working conditions.

[0010] According to the above technical scheme, in order to ensure the matching dimensional accuracy of the anode conductive concave groove in the width direction and the anode conductive crossbeam connection interface, the anode conductive concave groove arranged on the anode carbon block can be obtained by planing and milling machining after roasting and forming.

[0011] In the process of electrolytic aluminum production, the anode carbon block technical solution of the present invention having a conductive connection concave groove on the upper part of the anode carbon block can be adopted, which can not only implement the iron-carbon interface connection of the anode carbon block and the rectangular anode conductive beam by direct contact, but also eliminate the transition conductive connection layer cast phosphorus pig iron transition conductive connection layer between the anode steel claw and the anode carbon block in the prior art, thereby achieving the goal of reducing the resistance value and voltage drop of the aluminum electrolytic cell structure, and can also achieve the purpose of reducing the equipment investment in the anode assembly production workshop and the process cost of casting phosphorus pig iron structure.

[0012] Description of the drawings: The technical features and specific implementation methods of the anode carbon block provided with a conductive connection concave groove described in the present invention will be more clearly described through the following description of the drawings and embodiments.

[0013] Figure 1 This is a front view of the assembly structure of the anode carbon block and the anode conductive beam in Example 1.

[0014] Figure 2is Figure 1 Side view of

[0015] Figure 3 is Figure 1 Top view of the anode carbon block.

[0016] Figure 4 is the front view of the assembled structure of the anode carbon block and the anode conductive crossbeam in Embodiment 2

[0017] Figure 5 is Figure 4 Side view of

[0018] Figure 6 is Figure 4 Top view of the anode carbon block.

[0019] Figure 7 is the side sectional view of the assembled structure of the anode carbon block and the anode conductive crossbeam in Embodiment 3.

[0020] Figure 8 is the side sectional view of the assembled structure of the anode carbon block and the anode conductive crossbeam in Embodiment 4.

[0021] Figure 9 is the side sectional view of the assembled structure of the anode carbon block and the anode conductive crossbeam in Embodiment 5.

[0022] Figure 10 is the side sectional view of the assembled structure of the anode carbon block and the anode conductive crossbeam in Embodiment 6.

[0023] Figure 11 is the side sectional view of the assembled structure of the anode carbon block and the anode conductive crossbeam in Embodiment 7.

[0024] Figure 12 is the front view of the anode carbon block in Embodiment 7.

[0025] Figure 13 is the process plan view for assembling the anode conductive crossbeam and the anode carbon block in Embodiment 7.

[0026] As shown in the figure: 1 anode carbon block, 2 anode conductive concave groove, 3 anode conductive crossbeam, 4 anode conductive column, 5 iron-carbon bonding processing interface, 6 trapezoidal anode conductive concave groove, 7 anode conductive concave groove with semi-circular card slots on the side wall, 8 anode conductive concave groove with rectangular card slots on the side wall, 9 male and female tenon and mortise convex platform on the side of the anode conductive crossbeam, 10 expanded graphite conductive plug installation hole, 11 expanded graphite conductive plug, 12 support inclined iron.

[0027] Specific implementation manner: For an anode carbon block provided with a conductive connection concave groove according to the present invention, its technical features and specific implementation manners will be clearer through the following description of the drawings and embodiments.

[0028] Example 1: As Figure 1 Figure 2 and Figure 3 shown, for the anode carbon block (1) described in this Example 1, its upper top surface is a horizontal structure, and an anode conductive concave groove (2) for installing the anode conductive crossbeam (3) is provided at the upper part of the anode carbon block. The width of the anode conductive concave groove (2) is greater than the height of the anode conductive concave groove (2). The iron-carbon bonding interface in the middle between the anode conductive concave groove (2) and the anode conductive crossbeam (3) is the iron-carbon bonding processing interface (5). The clearance fit dimension between the two should be less than the dimension of the linear thermal expansion variable of the anode conductive crossbeam (3) under the condition of the thermal working temperature (≤950 °C), so as to generate a high-strength structural connection and a tight conductive connection between the anode carbon block (1) and the anode conductive crossbeam (3). The shape of the horizontal projection of the anode conductive concave groove (2) provided on the top horizontal plane of the anode carbon block (1) in this example is a rectangular structure with arcs at both ends.

[0029] Example 2: As Figure 4 Figure 5 and Figure 6 shown, an anode carbon block with a conductive connection concave groove provided at the top described in this Example 2 is basically the same as that in Example 1. The distinguishing technical feature is that the horizontal projection of the anode conductive concave groove (2) provided on the top horizontal plane of the anode carbon block (1) is a rectangular strip structure that penetrates from left to right. The main purpose of designing the anode conductive concave groove (2) into a rectangular long strip structure that penetrates from left to right on the top of the anode carbon block (1) in this example is to facilitate the machining of the anode conductive concave groove and form a side iron-carbon bonding processing interface (5) of the anode conductive concave groove (2) with relatively high fitting dimension accuracy.

[0030] Example 3: As Figure 7 shown, an anode carbon block (1) with a conductive connection concave groove provided at the top described in this Example 3 is basically the same as that in Example 2. The distinguishing technical feature is that the side cross-sectional projection of the anode conductive concave groove (2) provided on the top horizontal plane of the anode carbon block is a trapezoidal structure shape with a smaller upper end and a larger lower end. The design purpose of this structure is that after the anode carbon block (1) and the anode conductive crossbeam (2) are configured and assembled, the structural connection strength between the two can be improved, and the displacement in the height direction between the anode carbon block and the anode conductive device can be prevented, thus preventing the anode carbon block from falling off.

[0032] Example 4: As Figure 8As shown in the figure, an anode carbon block with a conductive connection concave groove described in Embodiment 4 is basically the same as that in Embodiment 2. The side cross-sectional projection of the anode conductive concave groove (2) provided on the top horizontal plane of the anode carbon block (1) is also a rectangular structure. Its distinguishing technical feature is that on the side conductive bonding interface of the anode conductive concave groove (2), a rectangular groove is provided for tenon and mortise hook connection with the anode conductive crossbeam, that is, an anode conductive concave groove (8) with a rectangular card slot on the side wall is formed. Its design purpose is to improve the structural connection strength between the anode carbon block and the anode conductive crossbeam after the configuration and assembly of the anode carbon block and the anode conductive crossbeam, and prevent the displacement in the height direction between the anode carbon block and the anode conductive device, resulting in the detachment of the anode carbon block.

[0033] Embodiment 5: As Figure 9 shown in the figure, an anode carbon block with a conductive connection concave groove described in Embodiment 5 is basically the same as that in Embodiment 4. Its distinguishing feature is that on the side conductive bonding interface of the anode conductive concave groove (2), the cross-section of the groove for tenon and mortise hook connection between the anode carbon block (1) and the anode conductive crossbeam (3) is semi-circular (7). The design purpose is to improve the structural connection strength between the anode carbon block and the anode conductive crossbeam after the configuration and assembly of the anode carbon block and the anode conductive crossbeam, and prevent the displacement in the height direction between the anode carbon block and the anode conductive device, resulting in the detachment of the anode carbon block.

[0033] Embodiment 6: As Figure 10 shown in the figure, in order to improve the electrical conductivity of the iron-carbon contact interface between the conductive connection concave groove of the anode carbon block and the anode conductive crossbeam, an installation hole (10) for installing an expanded graphite conductive plug for construction configuration is provided on the anode carbon block conductive concave groove. After installing the expanded graphite conductive plug (11) in this hole, under the electrolytic thermal working condition, the graphite material can fill into the structural gaps of the iron-carbon bonding interface between the anode conductive concave groove and the anode conductive crossbeam, enabling a closer conductive connection and combination between the two. It should be noted that the expanded graphite conductive plug used here is the expanded graphite conductive plug for the graphite electrode joint of the metallurgical electric arc furnace.

[0034] Embodiment 7: To solve the problem that in Embodiment 3 as Figure 8 shown in the figure; Embodiment 4 as Figure 9 shown in the figure, Embodiment 4 as Figure 10 shown in the figure, since the overall structural width dimension of the anode conductive crossbeam (3) is larger than the upper opening dimension of the anode conductive groove (2), the anode conductive crossbeam (3) cannot be directly installed into the anode conductive concave groove (2) from the upper part of the anode carbon block (1), Embodiment 7 provides a solution, as Figure 11 Figure 12 and Figure 13As shown, a technical solution is to horizontally displace the anode conductive crossbeam (3) from the side end of the anode carbon block (1) and install the anode conductive crossbeam (3) into the anode conductive concave groove (2) of the anode carbon block (1), so as to realize the mortise and tenon structure connection between the anode carbon block (1) and the anode conductive crossbeam (3), thereby improving the connection strength between the two and preventing the anode carbon block from falling off the anode conductive metal device, and avoiding the occurrence of the phenomenon of pole detachment accidents.

Claims

1. An anode carbon block provided with a conductive connection concave groove, characterized in that: The upper top of the flat-top anode carbon block (1) is provided with an anode conductive concave groove (2) for assembling an anode conductive crossbeam (3) and having a cross-sectional width greater than a cross-sectional height.

2. The anode carbon block provided with a conductive connection concave groove according to claim 1, characterized in that: When designing the assembly structure of the anode carbon block (1) and the anode conductive cross beam (3), the characteristic that the thermal expansion coefficient of the anode conductive cross beam (3) is greater than that of the carbon material of the anode carbon block (1) should be utilized so that after the anode conductive cross beam (3) is assembled into the anode conductive concave groove (2), a firm structural connection and a tight iron-carbon interface conductive connection can be generated.

3. The anode carbon block provided with a conductive connection concave groove according to claim 1, characterized in that: The width of the rectangular cross section of the anode conductive concave groove (2) is greater than the height of the rectangular cross section of the concave groove. The cross section of the anode conductive concave groove is a trapezoidal groove type, or a mortise and tenon concave groove type structure with a bite groove on the side wall.

4. The anode carbon block provided with a conductive connection concave groove according to claim 1, characterized in that: The assembly dimension deviation between the anode conductive concave groove (2) of the anode carbon block and the width of the anode conductive beam (3) should be smaller than the variable value of the linear width of the anode conductive beam (3) in the width direction of the thermal expansion under the electrolytic heat working condition technical conditions.

5. The anode carbon block provided with a conductive connection concave groove according to claim 1, characterized in that: In order to ensure the accuracy of the width-direction dimension matching of the connection interface between the anode conductive concave groove (2) and the anode conductive cross beam (3), the anode conductive connection concave groove arranged on the anode carbon block (1) can be obtained by planing and milling machining after being calcined and formed.

6. The anode carbon block provided with a conductive connection concave groove according to claim 1, characterized in that: The horizontal projection of the anode conductive concave groove (2) arranged on the horizontal surface of the top of the anode carbon block (1) is a rectangular strip structure penetrating from left to right, or a rectangular structure with arcs at both ends.

7. The anode carbon block provided with a conductive connection concave groove according to claim 1, characterized in that: The projection of the side section of the anode conductive concave groove (2) is a trapezoidal structure with a small upper end and a large lower end.

8. The anode carbon block provided with a conductive connection concave groove according to claim 1, characterized in that: A connecting slot for the anode carbon block (1) and the anode conductive cross beam (3) to be connected by a mortise and tenon hook structure is provided on the side conductive bonding interface of the anode conductive concave groove (2); the cross section of the connecting slot is semicircular or rectangular.

9. The anode carbon block provided with a conductive connection concave groove according to claim 1, characterized in that: An installation hole (10) for installing an expanded graphite conductive plug used for structural configuration is arranged on the anode conductive concave groove of the anode carbon block (1).

10. The anode carbon block provided with a conductive connection concave groove according to claim 1, characterized in that: The anode conductive cross beam (3) is installed into the anode conductive concave groove (2) of the anode carbon block (1) from the side end of the anode carbon block (1) by means of horizontal displacement, thereby realizing a mortise and tenon hanging structural connection between the anode carbon block (1) and the anode conductive cross beam (3).

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